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arXiv · 1805.03760

Observation and control of nonlinear electromagnetic topological edge states

D. A. Dobrykh·A. V. Yulin·A. P. Slobozhanyuk·A. N. Poddubny·Yu. S. Kivshar
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Abstract

Topological photonics has recently emerged as a route to realize robust optical circuitry, and nonlinear effects are expected to enable tunability of topological states with the light intensity. Here we realize experimentally nonlinear self-induced spectral tuning of the electromagnetic topological edge states in an array of coupled nonlinear resonators in a pump-probe experiment. In a weakly nonlinear regime, we observe that resonators frequencies exhibit spectral shifts, that are concentrated mainly at the edge mode affecting only weakly the bulk modes. For a strong pumping, we describe several scenarios of the transformation of the edge states and their hybridization with bulk modes, and also predict a parametrically driven transition from topological to unstable regimes.

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D. A. Dobrykh, A. V. Yulin, A. P. Slobozhanyuk, A. N. Poddubny, Yu. S. Kivshar. 2018-05-10. Observation and control of nonlinear electromagnetic topological edge states. https://doi.org/10.1103/physrevlett.121.163901

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